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STSmartVoice demonstration board based on MP34DT01
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The STEVAL-MKI126V3 demonstration board allows the connection of up to six microphones using the sockets provided, or through the connection of a dedicated six-microphone array.

The digital interface of the board allows the interfacing of the MIC output to the most widely used audio receivers and digital amplifiers, or permits evaluation of the MIC with generic audio measurement equipment. The filtered PWM signals allow the connection of a headset to listen to audio received through the microphones.

The fully digital path ensures a high level of processing with sound preconditioning, filtering and voice enhancement.

The main function of the STEVAL-MKI126V3 is to convert the PDM signals from the microphones into more common I2S and PWM signals.

The I2S signal is routed both on a general and interface connector. appropriately filtered PWM signals provide an analog interface.

The STEVAL-MKI126V3 is equipped with two MP34DT01 microphones and an STA321MPL scalable digital microphone processor.

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Data Brief

Key Features

  • 2 on-board MEMS MP34DT01 microphones on board
  • Capable of driving up to 6 digital MEMS microphones
  • 3 independent I2S outputs
  • Up to 10 independent 32-bit user programmable biquads per channel
  • The demonstration board is fully configurable with:
  • STEVAL-MKI129V1/V2/V3
  • STEVAL-MKI131V1/V2/V3
  • STEVAL-MKI117V1/V2
  • Controllable via APWorkbench software suite
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1757: STSmartVoice demonstration board based on MP34DT01
2.0 292 KB

Application Notes

Description Version Size
AN4146: STSmartVoice demonstration board STEVAL-MKI126Vx
2.0 3,511 KB
AN4227: Audio hub demonstration kit supporting the M45DT02, MP34DB01, and MP34DT01 microphones
1.0 1,572 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-MKI126V3 gerber files
1.0 473 KB

Bill of Materials

Description Version Size
2.0 10 KB

Schematic Pack

Description Version Size
STEVAL-MKI126V3 schematics
2.0 97 KB

Related Tools and Software

Related Tools and Software

Part Number Description
APWorkbench Audio Processor Workbench software development suite

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-MKI126V3ActiveSTA321MPL; MP34DT01Buy Direct99.22Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA10

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.